Returns the Open Geospatial Consortium (OGC) Well-Known Text (WKT) representation of a SqlGeography instance augmented with any Z (elevation) and M (measure) values carried by the instance.(Overrides Object.ToString().)

SQL Server supports a set of methods for the geography spatial data type. These methods include methods on geography that are defined by the Open Geospatial Consortium (OGC) standard and a set of Microsoft extensions to that standard.